A steel angle iron, loaded in compression is added to a structure in order to increase its rigidity. Although the two ends are attached by rivets, the end fixity is sufficiently questionable that pinned ends are to be assumed. The length is 1.2 m, and the yield strength is 350 MPa. The radius of gyration about centroidal axis parallel to either side is 8 mm, but the minimum radius of gyration (about a centroidal axis at 45 degrees to the sides) is only 5 mm. What compressive load (express as a function of the cross-sectional area, A) can be carried with a safety factor of 3?

A component made of Aluminium 6061-T651 has an edge crack with length equal to 15 mm, as shown The yield stress of the material is oy = 280 MPa and its fracture toughness (Kic) ranges from 40 MN/m3/2 to 60 MN/m³/2 Consider now the same edge crack in a semi-infinite plate. Determine the critical stress to avoid fracture. P I I I I ← 15 mm P↓ 100 mm 30 mm

True of false? The more ductile steel is, the greater will be its toughness.

The pin-connected structure consists of a rigid beam ABCD and two supporting bars. Bar (1) is an aluminum alloy [E = 61 GPa] with a cross-sectional area of A₁ = 810 mm². Bar (2) is a bronze alloy [E = 103 GPa] with a cross-sectional area of A2 = 470 mm². Assume L₁=2.4 m, L₂=3.1 m, a=0.7 m, b=1.9 m, and c= 1.1 m. All bars are unstressed before the load P is applied; however, there is a 5.8-mm clearance in the pin connection at A. If a load of P = 44 kN is applied at B, determine: (a) the normal stresses 0₁, 0₂, in both bars (1) and (2). (b) the normal strains &1, 82, in bars (1) and (2). (c) determine the downward deflection VA of point A on the rigid bar. A Answers: (a) 0₁ = (STVA = a i i B 156.10 0.00256 b C MPa, 0₁ = με, €2 = mm L2 i i D 20.75 0.0002014 MPa. με.